Make the appropriate settings under Configuration->Layout Setting.
Banner Display Groups - Header Position 1 = Banner1
Banner Display Groups - Header Position 2 = Banner2
Banner Display Groups - Header Position 3 = Banner3
etc.
Now, I can see your first and second banner are using Header Position 2 and header Position 3.
Do the following:
Banner Display Groups - Header Position 2 = Left
Banner Display Groups - Header Position 3 = MidLeft
Go to Banner Manager and set your first banner to group Left1 (Left2, Left3 - depending on your language IDs)
Next, set your second banner to group MidLeft1 (MidLeft2, Midleft3...)
That should do the trick.
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